Celsius has more caffeine than Coca-Cola Zero Sugar: 200mg vs 34mg in the same 12 oz can. That is a 166mg gap, and since the cans match, the per-serving number is the whole story.
These are different categories of drink, which changes how the caffeine arrives. Energy drinks and sodas list an exact number because caffeine is a measured additive; brewed drinks vary with the beans and the brew, so their figures are compiled averages. The numbers here are the standard published values for each.
Coca-Cola Zero Sugar vs Celsius: the numbers
| Coca-Cola Zero Sugar | Celsius | |
|---|---|---|
| Caffeine per serving | 34mg per 12 oz can | 200mg per 12 oz can |
| Caffeine per fl oz | 2.8mg | 16.7mg |
| Servings to reach 400mg (FDA context) | 11.8 | 2.0 |
Sources: Coca-Cola Zero Sugar's figure is verified in our Coca-Cola Zero Sugar caffeine guide against Caffeine Informer (source); Celsius's figure is verified in our Celsius guide against Celsius essential facts (source).
The concentration gap is the striking part: Celsius packs roughly 6 times the caffeine per ounce. Sipping speed matters at that density; a 12 oz can finished in minutes hits differently than the same milligrams spread over a slow cup.
Which one should you pick?
Pick Coca-Cola Zero Sugar when you want the lighter dose or a slower ramp, and Celsius when you actually need the bigger hit and know your tolerance. If you are stacking either with other caffeinated drinks through the day, run the math against the 400mg reference rather than guessing.
For context, the FDA cites 400mg of caffeine a day as an amount generally not associated with negative effects in healthy adults. Tolerance and health vary, so treat these numbers as information, not advice.
Related reading
- Coca-Cola Zero Sugar: the full caffeine guide
- Celsius: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
- Compare any two of 120+ drinks
FAQ
Does Coca-Cola Zero Sugar or Celsius have more caffeine? Celsius: 200mg per 12 oz can versus 34mg per 12 oz can for Coca-Cola Zero Sugar.
Which is stronger per ounce? Celsius, at about 16.7mg per fluid ounce versus 2.8mg for Coca-Cola Zero Sugar.
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